气候变化领域集成服务门户(CCPortal): Decreasing wind speed and weakening latitudinal surface pressure gradients in the Tibetan Plateau

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DOI	10.3354/cr00864
	Decreasing wind speed and weakening latitudinal surface pressure gradients in the Tibetan Plateau
	You, Qinglong; Kang, Shichang; Fluegel, Wolfgang-Albert; Pepin, Nick; Yan, Yuping; Huang, Jie
发表日期	2010
ISSN	0936-577X
EISSN	1616-1572
卷号	42 期号:1
英文摘要	The Tibetan Plateau, with an average elevation of over 4000 m above sea level, is the highest and most extensive highland in the world. Between 1980 and 2005, the annual mean temperature has warmed at the rate of 0.38 degrees C decade(-1). However, little attention has been paid to the variation of wind speed, the most important factor controlling evapotranspiration in the Tibetan Plateau. Here we used monthly mean wind speed from the Chinese Meteorological Administration data set to examine the spatial and temporal variability of wind speed at 71 stations (with elevations above 2000 m above sea level) in the eastern and central Tibetan Plateau during 1980-2005, and compared wind speed climatology and their trends with NCEP and ERA-40 reanalyses in the same domain. Compared with surface stations, NCEP overestimates wind speed and ERA-40 underestimates it, with mean annual biases of 0.93 m s(-1) for NCEP and -0.75 m s(-1) for ERA-40. Both surface stations and NCEP reanalysis show significant decreasing trends, at rates of -0.24 and -0.13 m s(-1) decade(-1), respectively, mainly evident in spring and summer. ERA-40 fails to capture any decrease. The above results indicate that NCEP captures wind speed better than ERA-40. We speculate that the most likely cause of diminishing wind speed are the asymmetrically decreasing latitudinal surface temperature and pressure gradients over the Tibetan Plateau, which may be part of a large-scale atmospheric circulation shift.
关键词	Tibetan Plateau Wind speed NCEP ERA-40 Pressure gradient
学科领域	Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences ; Meteorology & Atmospheric Sciences
来源期刊	CLIMATE RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111584
作者单位	Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Change & Land Surface Pr, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	You, Qinglong,Kang, Shichang,Fluegel, Wolfgang-Albert,et al. Decreasing wind speed and weakening latitudinal surface pressure gradients in the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2010,42(1).
APA	You, Qinglong,Kang, Shichang,Fluegel, Wolfgang-Albert,Pepin, Nick,Yan, Yuping,&Huang, Jie.(2010).Decreasing wind speed and weakening latitudinal surface pressure gradients in the Tibetan Plateau.CLIMATE RESEARCH,42(1).
MLA	You, Qinglong,et al."Decreasing wind speed and weakening latitudinal surface pressure gradients in the Tibetan Plateau".CLIMATE RESEARCH 42.1(2010).